feat: complete Wallonia land cover and terrain sources

CHANGELOG.md

@@ -9,6 +9,22 @@
 
 ## Unreleased - Post-V1 capability completion (2026-07-19)
 
+- Added the official WALOUS 2018 GeoTIFF as a third live-provisioned Walloon
+  land-cover epoch. Its stable SPW artifact, archive/raster checksums, EPSG:3812
+  identity and published stacked class codes are validated fail-closed. The
+  official view-class crosswalk normalizes stacked codes to the existing
+  11-class series, while source value `0` is explicitly treated as background
+  nodata and never contributes to area metrics.
+- Added bounded Walloon terrain acquisition from the official SPW MNT
+  2021-2022 1 m GeoTIFF. Operator provisioning validates archive bounds, safe
+  extraction, CRS, resolution, band count, elevation samples and checksums;
+  selection persistence and terrain metrics retain DNG/EPSG:5710 instead of
+  incorrectly labelling Walloon elevations as TAW.
+- Extended detection-model capabilities with machine-readable training scope,
+  validation scope, validated regions, national-validation status and the
+  operator-review requirement. The configured local model remains bound to
+  Mol/Kempen evidence and cannot become nationally labelled through frontend
+  copy alone.
 - Completed live WALOUS 2020/2023 provisioning and fixed signed `int8` source
   reads with nodata `-128` across acquisition, analysis and PNG rendering. A
   dedicated regression now proves conversion to the persisted `uint8`/`255`